"The value of money rises when the same inner values (_innere Werte_) of commodities are expressed in lower prices; it falls, when they are expressed in higher prices" (II, 511-12). "Inner value" of goods is not defined, but I take it that Wieser uses it as meaning essentially the same thing as the public economic value already described--an absolute value. (_Cf._ the usage of Menger and von Mises, _infra_, in this chapter, with respect to the terms, "inner" and "outer" value.) The definition is not strictly circular, perhaps, but at least it is pretty empty. Nothing appears to give the value of money, as distinct from its purchasing power, an independent standing. The reason for this will later appear. It should be noted, however, that the definition is not in terms of prices or purchasing power. Prices might remain unchanged, in Wieser's scheme, and yet the value of money sink, if the inner values of goods should sink. The value of money, thus defined, is to be explained by marginal utility. But money has no marginal utility of its own, it has no subjective use-value, but only a subjective exchange value,--derived from the use-value (marginal utility) of the commodity purchased with the marginal dollar (II, 507-8). This subjective-exchange value of money is the personal value of money, as distinguished from its public economic value, and is the cause of the public economic value. The personal value of money changes (1) with the volume of one's personal income, (2) with the intensity of one's need for money, and (3) with market prices. The personal value of money is directly influenced and measured only in exchanges for consumption goods. Expenditures of other kinds affect it only indirectly by leaving less for consumption expenditures. The laborer always reckons with the personal value of money, but not the business man, in his business calculations. As in the case of goods, we pass from personal to public economic value (II, 509). The personal value of money depends on the relation between an individual's money income, and his real income, in terms of goods. The public economic value of money depends on the money income of the community as a whole, and its real income. (II, 516-18). Money income grows faster than real income, through the extension of the money economy. Money income is not, like real income, dependent on quantity. The mere extension of the money economy increases the volume of money income, lowers the personal value of money, lowers its public economic value, and raises prices. Witness the effect on a rural community of bringing it into the great market, where all costs are reckoned in money and rising costs compel rising prices. Hence, there is a tendency for the public economic value of money to sink, and this has been the historical fact (I, II, 519-520.)